IMF predicts Poland's economy will slow down in 2012

Yes, Consumer & Investor confidence is a huge part of it. When there is breaking news like the IMF saying Poland will decline it makes it so people are less likely to invest.

This is why it is important for leaders during a recession or depression to keep up consumer & invester confidence.
If consumer of Investor confidence goes down.

I saw one or two plunges of Polish zloty currency after irresponsible politicians gave interviews

Not strictly true, paiwan. It is very common to "talk down" a currency when perceived to be too strong,in order to boost exports and give a good price to foreign investors. Every country does it with a few exceptions like Canada and Aus.
Google "currency wars", if interested

The IMF will look to cripple you, make no mistake about it!